Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/FunctionResolver.java @ 5604:7e837c5c377b
Datacage: toValue/fromValue: Use constant instead of hard coded number.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Tue, 09 Apr 2013 08:28:07 +0200 |
parents | f8a4ee86d276 |
children | 62513c9183ba |
rev | line source |
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Datacage: Moved templating in a better suited package.
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1 package de.intevation.flys.artifacts.datacage.templating; |
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2 |
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3 import java.util.ArrayList; |
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4 import java.util.Collection; |
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5 import java.util.List; |
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6 import java.util.Map; |
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7 |
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8 import javax.xml.namespace.QName; |
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9 |
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10 import javax.xml.xpath.XPathFunction; |
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11 import javax.xml.xpath.XPathFunctionException; |
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12 import javax.xml.xpath.XPathFunctionResolver; |
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13 |
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14 import org.apache.log4j.Logger; |
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15 |
4594 | 16 |
17 /** Resolves functions (e.g. dc:contains) in Datacage/Meta-Data system. */ | |
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18 public class FunctionResolver |
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19 implements XPathFunctionResolver |
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20 { |
4594 | 21 /** Home logger. */ |
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22 private static Logger log = Logger.getLogger(FunctionResolver.class); |
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23 |
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24 public static final String FUNCTION_NAMESPACE_URI = "dc"; |
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25 |
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26 public static final double FAR_AWAY = 99999d; |
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27 |
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28 public static final class Entry { |
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29 |
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30 String name; |
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31 XPathFunction function; |
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32 int arity; |
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33 |
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34 public Entry() { |
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35 } |
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36 |
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37 public Entry(String name, XPathFunction function, int arity) { |
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38 this.name = name; |
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39 this.function = function; |
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40 this.arity = arity; |
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41 } |
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42 } // class Entry |
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43 |
4594 | 44 /** List of functions. */ |
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45 protected List<Entry> functions; |
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46 |
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47 protected Builder.BuildHelper buildHelper; |
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48 |
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49 |
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50 public FunctionResolver() { |
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51 this(null); |
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52 } |
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53 |
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54 public FunctionResolver(Builder.BuildHelper buildHelper) { |
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55 this.buildHelper = buildHelper; |
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56 |
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57 functions = new ArrayList<Entry>(); |
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58 |
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59 addFunction("contains", 2, new XPathFunction() { |
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60 @Override |
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61 public Object evaluate(List args) throws XPathFunctionException { |
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62 return contains(args); |
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63 } |
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64 }); |
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65 |
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66 addFunction("fromValue", 3, new XPathFunction() { |
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67 @Override |
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68 public Object evaluate(List args) throws XPathFunctionException { |
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69 return fromValue(args); |
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70 } |
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71 }); |
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72 |
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73 addFunction("toValue", 3, new XPathFunction() { |
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74 @Override |
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75 public Object evaluate(List args) throws XPathFunctionException { |
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76 return toValue(args); |
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77 } |
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78 }); |
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79 |
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80 addFunction("replace", 3, new XPathFunction() { |
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81 @Override |
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82 public Object evaluate(List args) throws XPathFunctionException { |
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83 return replace(args); |
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84 } |
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85 }); |
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86 |
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87 addFunction("has-result", 0, new XPathFunction() { |
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88 @Override |
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89 public Object evaluate(List args) throws XPathFunctionException { |
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90 return FunctionResolver.this.buildHelper.hasResult(); |
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91 } |
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92 }); |
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93 } |
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94 |
4594 | 95 /** |
96 * Create a new function. | |
97 * @param name Name of the function. | |
98 * @param arity Number of arguments for function. | |
99 * @param function the function itself. | |
100 */ | |
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101 public void addFunction(String name, int arity, XPathFunction function) { |
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102 functions.add(new Entry(name, function, arity)); |
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103 } |
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104 |
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105 @Override |
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106 public XPathFunction resolveFunction(QName functionName, int arity) { |
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107 |
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108 if (!functionName.getNamespaceURI().equals(FUNCTION_NAMESPACE_URI)) { |
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109 return null; |
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110 } |
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111 |
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112 String name = functionName.getLocalPart(); |
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113 for (Entry entry: functions) { |
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114 if (entry.arity == arity && entry.name.equals(name)) { |
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115 return entry.function; |
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116 } |
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117 } |
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118 |
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119 return null; |
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120 } |
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121 |
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122 /** Implementation of case-ignoring dc:contains. */ |
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123 public Object contains(List args) throws XPathFunctionException { |
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124 Object haystack = args.get(0); |
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125 Object needle = args.get(1); |
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126 |
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127 if (needle instanceof String) { |
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128 needle = ((String)needle).toUpperCase(); |
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129 } |
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130 |
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131 try { |
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132 if (haystack instanceof Collection) { |
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133 return Boolean.valueOf( |
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134 ((Collection)haystack).contains(needle)); |
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135 } |
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136 |
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137 if (haystack instanceof Map) { |
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138 return Boolean.valueOf( |
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139 ((Map)haystack).containsKey(needle)); |
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140 } |
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141 |
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142 if (haystack instanceof Object []) { |
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143 for (Object straw: (Object [])haystack) { |
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144 if (straw.equals(needle)) { |
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145 return Boolean.TRUE; |
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146 } |
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147 } |
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148 } |
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149 |
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150 return Boolean.FALSE; |
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151 } |
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152 catch (Exception e) { |
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153 log.error(e); |
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154 throw new XPathFunctionException(e); |
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155 } |
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156 } |
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157 |
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158 /** Implementation for getting the minimum value of location or distance |
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159 * dc:fromValue. |
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160 */ |
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161 public Object fromValue(List args) throws XPathFunctionException { |
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162 Object mode = args.get(0); |
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163 Object locations = args.get(1); |
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164 Object from = args.get(2); |
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165 |
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166 if (!(mode instanceof String)){ |
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167 return -FAR_AWAY; |
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168 } |
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169 |
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170 if (mode.equals("locations")) { |
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171 if (!(locations instanceof String)) { |
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172 return -FAR_AWAY; |
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173 } |
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174 String loc = ((String)locations).replace(" ", ""); |
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175 String[] split = loc.split(","); |
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176 if (split.length < 1) { |
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177 return -FAR_AWAY; |
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178 } |
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179 try { |
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180 double min = Double.parseDouble(split[0]); |
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181 for (int i = 1; i < split.length; ++i) { |
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182 double v = Double.parseDouble(split[i]); |
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183 if (v < min) { |
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184 min = v; |
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185 } |
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186 } |
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187 return min; |
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188 } |
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189 catch (NumberFormatException nfe) { |
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190 return -FAR_AWAY; |
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191 } |
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192 } |
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193 else if (mode.equals("distance")) { |
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194 if (!(from instanceof String)) { |
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195 return -FAR_AWAY; |
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196 } |
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197 String f = (String)from; |
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198 try { |
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199 return Double.parseDouble(f); |
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200 } |
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201 catch(NumberFormatException nfe) { |
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202 return -FAR_AWAY; |
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203 } |
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204 } |
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205 else { |
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206 return -FAR_AWAY; |
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207 } |
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208 } |
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209 |
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210 /** Implementation for getting the maximum value of location or distance |
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211 * dc:toValue. |
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212 */ |
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213 public Object toValue(List args) throws XPathFunctionException { |
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214 Object mode = args.get(0); |
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215 Object locations = args.get(1); |
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216 Object to = args.get(2); |
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217 |
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218 if (!(mode instanceof String)){ |
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219 return FAR_AWAY; |
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220 } |
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221 |
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222 if (mode.equals("locations")) { |
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223 if (!(locations instanceof String)) { |
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224 return FAR_AWAY; |
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225 } |
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226 try { |
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227 String loc = ((String)locations).replace(" ", ""); |
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228 String[] split = loc.split(","); |
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229 if (split.length < 1) { |
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230 return FAR_AWAY; |
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231 } |
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232 double max = Double.parseDouble(split[0]); |
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233 for (int i = 1; i < split.length; ++i) { |
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234 double v = Double.parseDouble(split[i]); |
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235 if (v > max) { |
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236 max = v; |
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237 } |
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238 } |
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239 return max; |
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240 } |
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241 catch (NumberFormatException nfe) { |
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242 return FAR_AWAY; |
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243 } |
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244 } |
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245 else if (mode.equals("distance")) { |
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246 if (!(to instanceof String)) { |
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247 return FAR_AWAY; |
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248 } |
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249 else { |
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250 String t = (String)to; |
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251 try { |
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252 return Double.parseDouble(t); |
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253 } |
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254 catch(NumberFormatException nfe) { |
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255 return FAR_AWAY; |
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256 } |
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257 } |
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258 } |
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259 else { |
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260 return FAR_AWAY; |
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261 } |
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262 } |
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263 |
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264 /** Implementation for doing a string replace |
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265 * dc:replace |
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266 */ |
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267 public Object replace(List args) throws XPathFunctionException { |
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268 Object haystack = args.get(0); |
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269 Object needle = args.get(1); |
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270 Object replacement = args.get(2); |
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271 |
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272 if (needle instanceof String && |
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273 haystack instanceof String && |
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274 replacement instanceof String) { |
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275 return ((String)haystack).replace( |
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276 (String)needle, (String)replacement); |
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277 } else { |
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278 return haystack; |
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279 } |
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280 } |
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281 } |
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282 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |